rdfs:rdfs_subclass_of/2

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Predicate rdfs_subclass_of/2

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rdfs_subclass_of(+Class, ?Super) is nondet
rdfs_subclass_of(?Class, +Super) is nondet: Generate sub/super classes. rdf_reachable/3 considers the rdfs:subPropertyOf relation as well as cycles. Note that by definition all classes are subclass of rdfs:Resource, a case which is dealt with by the 1st and 3th clauses :-(
According to production 2.4 "rdfs:Datatype", Each instance of rdfs:Datatype is a subclass of rdfs:Literal.